Frequency conversion apparatus

A frequency conversion apparatus

• for converting the frequency of an outer input signal in which element signals having a predetermined frequency bandwidth are sequentially arranged in a predetermined frequency interval, comprising:
• frequency conversion sections of the same number as said element signals, each of said frequency conversion sections comprising:
• a first oscillator and a second oscillator both being capable of presetting the frequencies of signals output therefrom;
• a first frequency mixer for mixing the output signal of said first oscillator with said outer input signal to output a signal, the frequency of said signal being converted from the frequency of the outer input signal;
• a first filter for extracting a signal having a predetermined frequency bandwidth from the output signals of said first frequency mixer;
• a second frequency mixer for mixing the output signal of said second oscillator with the output signal of said first filter to output a signal, the frequency of said signal being converted from the frequency of the output signal of said first filter;
• and
• a second filter for extracting a signal having a predetermined frequency bandwidth from the output signals of said second frequency mixer;
• and
• a synthesizer for synthesizing the respective output signals from said frequency conversion sections to form an output signal,
• wherein the respective frequencies of said first and second oscillators are determined in accordance with a predetermined frequency setting rule specified by the relationship between said frequency conversion sections,
• wherein the center frequency of the output signal of said first filter of each of said frequency conversion sections is identical, and
• wherein, when the identification number of said frequency conversion sections is specified by i (0, 1, 2, . . . );
• the identification number said element signals is specified by j (0, 1, 2, . . . ) respectively;
• the output signals of said first and second oscillators in the i-th frequency conversion section is specified respectively by fL1_i and fL2_i, the desired center frequency of the output signal of said second filter in the i-th frequency conversion section is specified by fy_i;
• and the center frequency of the j-th element signal in said outer input signal is specified by fx_j,
• said predetermined frequency setting rule is expressed by the following equations:
• fL1—i=a+fx—j,
• fL2—i=fy—i −a,
• where a is a predetermined constant.

A frequency conversion apparatus

• for converting the frequency of an outer input signal in which element signals having a predetermined frequency bandwidth are sequentially arranged in a predetermined frequency interval, comprising:
• frequency conversion sections of the same number as said element signals, each of said frequency conversion sections comprising:
• a first oscillator and a second oscillator both being capable of presetting the frequencies of signals output therefrom;
• a first frequency mixer for mixing the output signal of said first oscillator with said outer input signal to output a signal, the frequency of said signal being converted from the frequency of the outer input signal;
• a first filter for extracting a signal having a predetermined frequency bandwidth from the output signals of said first frequency mixer;
• a second frequency mixer for mixing the output signal of said second oscillator with the output signal of said first filter to output a signal, the frequency of said signal being converted from the frequency of the output signal of said first filter;
• and
• a second filter for extracting a signal having a predetermined frequency bandwidth from the output signals of said second frequency mixer;
• and
• a synthesizer for synthesizing the respective output signals from said frequency conversion sections to form an output signal,
• wherein the respective frequencies of said first and second oscillators are determined in accordance with a predetermined frequency setting rule specified by the relationship between said frequency conversion sections,
• wherein the center frequency of the output signal of said first filter of each of said frequency conversion sections is identical, and
• wherein, in the case of the intervals Wx between the center frequencies of the respective element signals in said outer input signal being a fixed value, and when a desired fixed interval between the center frequencies of the respective output signals from said second filters is specified by Wy;
• the identification number of said frequency conversion sections is specified by i (0, 1, 2, . . . );
• and the output signals of said first and second oscillators in the i-th frequency conversion section is specified respectively by fL_i and fL2_i,
• said predetermined frequency setting rule is expressed by the following equations:
• fL1_i
• =
• a1
• +
• Wx
• ×
• i
• ,
• fL2_i
• =
• a1
• +
• Wy
• ×
• i
• ,
• where a1 and a2 are predetermined constants.